Fix: sanitize_array getting null arg instead of array

Author: shewa12

classes/Course.php

@@ -535,8 +535,8 @@ public function save_course_meta( $post_ID, $post ) {
 		// Additional data like course intro video.
 		if ( $additional_data_edit ) {
 			// Sanitize data through helper method.
-			$video = Input::sanitize_array(
-				$_POST['video'], //phpcs:ignore
+			$video        = Input::sanitize_array(
+				$_POST['video'] ?? array(), //phpcs:ignore
 				array(
 					'source_external_url' => 'esc_url',
 					'source_embedded'     => 'wp_kses_post',

classes/Lesson.php

@@ -173,7 +173,7 @@ public function save_lesson_meta( $post_ID ) {
 
 			// Sanitize data through helper method.
 			$video = Input::sanitize_array(
-				$_POST['video'], //phpcs:ignore
+				$_POST['video'] ?? array(), //phpcs:ignore
 				array(
 					'source_external_url' => 'esc_url',
 					'source_embedded'     => 'wp_kses_post',